Sometimes a question is trivial to answer with a Google search or two, but the answer is not on a stackexchange site. Are those questions still worth asking on SE or should they be closed?
Meta.stackoverflow.com has a lot of questions discussing this issue.
I can remember an answer posted for someone. It says something like that:
We must try to put the question as the first link on Google.
So, we should answer the question and spread it to lift the answer to first place.
At least this is the ideal scenario.
If someone asks such a question, we should answer them, proving the link and a quote or summary that demonstrates that the link answers the question. These are easy questions to get some easy rep on.
On the other hand, they don't make for very interesting content on this site, so we should try not to have too many of them. In particular, try Googling before you ask a question, and don't try to "seed" the site with lots of questions that can be answered this way.
See the "Links to BoardGameGeek (or other sites)" thread for some discussion on how best to provide these sorts of answers for things which are adequately answered by an existing link already.